MORE!!! [h=3]
Locks[/h]
Note: On Vortec and other heads using self aligning rocker arms, using a +0.050" lock can cause interference between the rocker tip and the locks/retainer. Rocker contacting the locks/retainer has been encountered using a combination of c/n 906 Vortec heads, Comp Pro Magnum rockers p/n 1317, Comp retainer p/n 787, Comp spring p/n 26918, and the +0.050" locks.
The engine builder must mock up the assembly and check the clearance closely. In the case there's insufficient clearance, there are a few options:
- Use non self aligning rocker arms. Requires guide plates be installed.
- Use longer valves
- Use a different spring/retainer combo that uses a standard lock
- If just the locks are hitting the rocker, using a shorter (lash cap compatible) lock like the Edelbrock p/n 9615 may help. This 7 degree lock is 0.050" lower than a regular lock.
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Use extreme caution if making the spring seat any deeper.
I contacted CompCams and their response was that they have not heard of the problem as I described.
I am going to continue to research and may elect to use different locks on the intake valves.